def _calcNumIntBits(minValue, maxValue, maxIntBits=7):
# TODO: there must be a better way, but at least this is correct
assert minValue <= maxValue
for i in range(maxIntBits):
precisionBits = 16 - i
minIntVal = floatToFixed(minValue, precisionBits)
maxIntVal = floatToFixed(maxValue, precisionBits)
if -32768 <= minIntVal and maxIntVal <= 32767:
return i + 1 # use one more: deltas may be bigger! (this is rather fuzzy)
raise ValueError("value does not fit in maxBits")
def compile(self, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
header = {"version": 0x00010000, "axisCount": len(axisTags)}
result = [sstruct.pack(AVAR_HEADER_FORMAT, header)]
for axis in axisTags:
mappings = sorted(self.segments[axis].items())
result.append(struct.pack(">H", len(mappings)))
for key, value in mappings:
fixedKey = floatToFixed(key, 14)
fixedValue = floatToFixed(value, 14)
result.append(struct.pack(">hh", fixedKey, fixedValue))
return bytesjoin(result)
def compile(self, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
header = {"version": 0x00010000, "axisCount": len(axisTags)}
result = [sstruct.pack(AVAR_HEADER_FORMAT, header)]
for axis in axisTags:
mappings = sorted(self.segments[axis].items())
result.append(struct.pack(">H", len(mappings)))
for key, value in mappings:
fixedKey = floatToFixed(key, 14)
fixedValue = floatToFixed(value, 14)
result.append(struct.pack(">hh", fixedKey, fixedValue))
return bytesjoin(result)
def toXML(self, writer, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
for axis in axisTags:
writer.begintag("segment", axis=axis)
writer.newline()
for key, value in sorted(self.segments[axis].items()):
# roundtrip float -> fixed -> float to normalize TTX output
# as dumped after decompiling or straight from varLib
key = fixedToFloat(floatToFixed(key, 14), 14)
value = fixedToFloat(floatToFixed(value, 14), 14)
writer.simpletag("mapping", **{"from": key, "to": value})
writer.newline()
writer.endtag("segment")
writer.newline()
def toXML(self, writer, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
for axis in axisTags:
writer.begintag("segment", axis=axis)
writer.newline()
for key, value in sorted(self.segments[axis].items()):
# roundtrip float -> fixed -> float to normalize TTX output
# as dumped after decompiling or straight from varLib
key = fixedToFloat(floatToFixed(key, 14), 14)
value = fixedToFloat(floatToFixed(value, 14), 14)
writer.simpletag("mapping", **{"from": key, "to": value})
writer.newline()
writer.endtag("segment")
writer.newline()
def compile(self, axisTags):
result = [sstruct.pack(FVAR_INSTANCE_FORMAT, self)]
for axis in axisTags:
fixedCoord = floatToFixed(self.coordinates[axis], 16)
result.append(struct.pack(">l", fixedCoord))
result.append(struct.pack(">H", self.postscriptNameID))
return bytesjoin(result)
def encodeFixed(f, pack=struct.pack):
"""For T2 only"""
value = floatToFixed(f, precisionBits=16)
if value & 0xFFFF == 0: # check if the fractional part is zero
return encodeIntT2(value >> 16) # encode only the integer part
else:
return b"\xff" + pack(">l", value) # encode the entire fixed point value
def compile(self, axisTags, includePostScriptName):
result = [sstruct.pack(FVAR_INSTANCE_FORMAT, self)]
for axis in axisTags:
fixedCoord = floatToFixed(self.coordinates[axis], 16)
result.append(struct.pack(">l", fixedCoord))
if includePostScriptName:
result.append(struct.pack(">H", self.postscriptNameID))
return bytesjoin(result)
def compileIntermediateCoord(self, axisTags):
needed = False
for axis in axisTags:
minValue, value, maxValue = self.axes.get(axis, (0.0, 0.0, 0.0))
defaultMinValue = min(value, 0.0) # -0.3 --> -0.3; 0.7 --> 0.0
defaultMaxValue = max(value, 0.0) # -0.3 --> 0.0; 0.7 --> 0.7
if (minValue != defaultMinValue) or (maxValue != defaultMaxValue):
needed = True
break
if not needed:
return None
minCoords = []
maxCoords = []
for axis in axisTags:
minValue, value, maxValue = self.axes.get(axis, (0.0, 0.0, 0.0))
minCoords.append(struct.pack(">h", floatToFixed(minValue, 14)))
maxCoords.append(struct.pack(">h", floatToFixed(maxValue, 14)))
return bytesjoin(minCoords + maxCoords)
def compileMasterValuesDict(storeBuilder, masterValuesDict, precisionBits):
coord = {}
for k, masterValues in masterValuesDict.items():
if allEqual(masterValues):
varIdx = 0xFFFFFFFF
else:
_, varIdx = storeBuilder.storeMasters(
[floatToFixed(v, precisionBits) for v in masterValues])
coord[k] = (masterValues[0], varIdx)
return coord
def test_floatToFixed_precision14(self):
self.assertEqual(13107, floatToFixed(0.8, 14))
self.assertEqual(16384, floatToFixed(1.0, 14))
self.assertEqual(16384, floatToFixed(1, 14))
self.assertEqual(-16384, floatToFixed(-1.0, 14))
self.assertEqual(-16384, floatToFixed(-1, 14))
self.assertEqual(0, floatToFixed(0, 14))
def test_floatToFixed_precision14(self):
self.assertEqual(13107, floatToFixed(0.8, 14))
self.assertEqual(16384, floatToFixed(1.0, 14))
self.assertEqual(16384, floatToFixed(1, 14))
self.assertEqual(-16384, floatToFixed(-1.0, 14))
self.assertEqual(-16384, floatToFixed(-1, 14))
self.assertEqual(0, floatToFixed(0, 14))
def instantiateVariableFont(varfont, location, inplace=False):
""" Generate a static instance from a variable TTFont and a dictionary
defining the desired location along the variable font's axes.
The location values must be specified as user-space coordinates, e.g.:
{'wght': 400, 'wdth': 100}
By default, a new TTFont object is returned. If ``inplace`` is True, the
input varfont is modified and reduced to a static font.
"""
if not inplace:
# make a copy to leave input varfont unmodified
stream = BytesIO()
varfont.save(stream)
stream.seek(0)
varfont = TTFont(stream)
fvar = varfont['fvar']
axes = {a.axisTag:(a.minValue,a.defaultValue,a.maxValue) for a in fvar.axes}
loc = normalizeLocation(location, axes)
if 'avar' in varfont:
maps = varfont['avar'].segments
loc = {k: piecewiseLinearMap(v, maps[k]) for k,v in loc.items()}
# Quantize to F2Dot14, to avoid surprise interpolations.
loc = {k:floatToFixedToFloat(v, 14) for k,v in loc.items()}
# Location is normalized now
log.info("Normalized location: %s", loc)
if 'gvar' in varfont:
log.info("Mutating glyf/gvar tables")
gvar = varfont['gvar']
glyf = varfont['glyf']
# get list of glyph names in gvar sorted by component depth
glyphnames = sorted(
gvar.variations.keys(),
key=lambda name: (
glyf[name].getCompositeMaxpValues(glyf).maxComponentDepth
if glyf[name].isComposite() else 0,
name))
for glyphname in glyphnames:
variations = gvar.variations[glyphname]
coordinates,_ = _GetCoordinates(varfont, glyphname)
origCoords, endPts = None, None
for var in variations:
scalar = supportScalar(loc, var.axes)
if not scalar: continue
delta = var.coordinates
if None in delta:
if origCoords is None:
origCoords,control = _GetCoordinates(varfont, glyphname)
endPts = control[1] if control[0] >= 1 else list(range(len(control[1])))
delta = iup_delta(delta, origCoords, endPts)
coordinates += GlyphCoordinates(delta) * scalar
_SetCoordinates(varfont, glyphname, coordinates)
else:
glyf = None
if 'cvar' in varfont:
log.info("Mutating cvt/cvar tables")
cvar = varfont['cvar']
cvt = varfont['cvt ']
deltas = {}
for var in cvar.variations:
scalar = supportScalar(loc, var.axes)
if not scalar: continue
for i, c in enumerate(var.coordinates):
if c is not None:
deltas[i] = deltas.get(i, 0) + scalar * c
for i, delta in deltas.items():
cvt[i] += otRound(delta)
if 'CFF2' in varfont:
log.info("Mutating CFF2 table")
glyphOrder = varfont.getGlyphOrder()
CFF2 = varfont['CFF2']
topDict = CFF2.cff.topDictIndex[0]
vsInstancer = VarStoreInstancer(topDict.VarStore.otVarStore, fvar.axes, loc)
interpolateFromDeltas = vsInstancer.interpolateFromDeltas
interpolate_cff2_PrivateDict(topDict, interpolateFromDeltas)
CFF2.desubroutinize()
interpolate_cff2_charstrings(topDict, interpolateFromDeltas, glyphOrder)
interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc)
del topDict.rawDict['VarStore']
del topDict.VarStore
if 'MVAR' in varfont:
log.info("Mutating MVAR table")
mvar = varfont['MVAR'].table
varStoreInstancer = VarStoreInstancer(mvar.VarStore, fvar.axes, loc)
records = mvar.ValueRecord
for rec in records:
mvarTag = rec.ValueTag
if mvarTag not in MVAR_ENTRIES:
continue
tableTag, itemName = MVAR_ENTRIES[mvarTag]
delta = otRound(varStoreInstancer[rec.VarIdx])
if not delta:
continue
setattr(varfont[tableTag], itemName,
getattr(varfont[tableTag], itemName) + delta)
log.info("Mutating FeatureVariations")
for tableTag in 'GSUB','GPOS':
if not tableTag in varfont:
continue
table = varfont[tableTag].table
if not hasattr(table, 'FeatureVariations'):
continue
variations = table.FeatureVariations
for record in variations.FeatureVariationRecord:
applies = True
for condition in record.ConditionSet.ConditionTable:
if condition.Format == 1:
axisIdx = condition.AxisIndex
axisTag = fvar.axes[axisIdx].axisTag
Min = condition.FilterRangeMinValue
Max = condition.FilterRangeMaxValue
v = loc[axisTag]
if not (Min <= v <= Max):
applies = False
else:
applies = False
if not applies:
break
if applies:
assert record.FeatureTableSubstitution.Version == 0x00010000
for rec in record.FeatureTableSubstitution.SubstitutionRecord:
table.FeatureList.FeatureRecord[rec.FeatureIndex].Feature = rec.Feature
break
del table.FeatureVariations
if 'GDEF' in varfont and varfont['GDEF'].table.Version >= 0x00010003:
log.info("Mutating GDEF/GPOS/GSUB tables")
gdef = varfont['GDEF'].table
instancer = VarStoreInstancer(gdef.VarStore, fvar.axes, loc)
merger = MutatorMerger(varfont, loc)
merger.mergeTables(varfont, [varfont], ['GDEF', 'GPOS'])
# Downgrade GDEF.
del gdef.VarStore
gdef.Version = 0x00010002
if gdef.MarkGlyphSetsDef is None:
del gdef.MarkGlyphSetsDef
gdef.Version = 0x00010000
if not (gdef.LigCaretList or
gdef.MarkAttachClassDef or
gdef.GlyphClassDef or
gdef.AttachList or
(gdef.Version >= 0x00010002 and gdef.MarkGlyphSetsDef)):
del varfont['GDEF']
addidef = False
if glyf:
for glyph in glyf.glyphs.values():
if hasattr(glyph, "program"):
instructions = glyph.program.getAssembly()
# If GETVARIATION opcode is used in bytecode of any glyph add IDEF
addidef = any(op.startswith("GETVARIATION") for op in instructions)
if addidef:
break
if addidef:
log.info("Adding IDEF to fpgm table for GETVARIATION opcode")
asm = []
if 'fpgm' in varfont:
fpgm = varfont['fpgm']
asm = fpgm.program.getAssembly()
else:
fpgm = newTable('fpgm')
fpgm.program = ttProgram.Program()
varfont['fpgm'] = fpgm
asm.append("PUSHB[000] 145")
asm.append("IDEF[ ]")
args = [str(len(loc))]
for a in fvar.axes:
args.append(str(floatToFixed(loc[a.axisTag], 14)))
asm.append("NPUSHW[ ] " + ' '.join(args))
asm.append("ENDF[ ]")
fpgm.program.fromAssembly(asm)
# Change maxp attributes as IDEF is added
if 'maxp' in varfont:
maxp = varfont['maxp']
if hasattr(maxp, "maxInstructionDefs"):
maxp.maxInstructionDefs += 1
else:
setattr(maxp, "maxInstructionDefs", 1)
if hasattr(maxp, "maxStackElements"):
maxp.maxStackElements = max(len(loc), maxp.maxStackElements)
else:
setattr(maxp, "maxInstructionDefs", len(loc))
if 'name' in varfont:
log.info("Pruning name table")
exclude = {a.axisNameID for a in fvar.axes}
for i in fvar.instances:
exclude.add(i.subfamilyNameID)
exclude.add(i.postscriptNameID)
if 'ltag' in varfont:
# Drop the whole 'ltag' table if all its language tags are referenced by
# name records to be pruned.
# TODO: prune unused ltag tags and re-enumerate langIDs accordingly
excludedUnicodeLangIDs = [
n.langID for n in varfont['name'].names
if n.nameID in exclude and n.platformID == 0 and n.langID != 0xFFFF
]
if set(excludedUnicodeLangIDs) == set(range(len((varfont['ltag'].tags)))):
del varfont['ltag']
varfont['name'].names[:] = [
n for n in varfont['name'].names
if n.nameID not in exclude
]
if "wght" in location and "OS/2" in varfont:
varfont["OS/2"].usWeightClass = otRound(
max(1, min(location["wght"], 1000))
)
if "wdth" in location:
wdth = location["wdth"]
for percent, widthClass in sorted(OS2_WIDTH_CLASS_VALUES.items()):
if wdth < percent:
varfont["OS/2"].usWidthClass = widthClass
break
else:
varfont["OS/2"].usWidthClass = 9
if "slnt" in location and "post" in varfont:
varfont["post"].italicAngle = max(-90, min(location["slnt"], 90))
log.info("Removing variable tables")
for tag in ('avar','cvar','fvar','gvar','HVAR','MVAR','VVAR','STAT'):
if tag in varfont:
del varfont[tag]
return varfont
def compileCoord(self, axisTags):
result = []
for axis in axisTags:
_minValue, value, _maxValue = self.axes.get(axis, (0.0, 0.0, 0.0))
result.append(struct.pack(">h", floatToFixed(value, 14)))
return bytesjoin(result)
def test_roundtrip(self):
for bits in range(0, 15):
for value in range(-(2**(bits + 1)), 2**(bits + 1)):
self.assertEqual(value,
floatToFixed(fixedToFloat(value, bits), bits))
def test_roundtrip(self):
for bits in range(0, 15):
for value in range(-(2**(bits+1)), 2**(bits+1)):
self.assertEqual(value, floatToFixed(fixedToFloat(value, bits), bits))
def instantiateVariableFont(varfont, location, inplace=False):
""" Generate a static instance from a variable TTFont and a dictionary
defining the desired location along the variable font's axes.
The location values must be specified as user-space coordinates, e.g.:
{'wght': 400, 'wdth': 100}
By default, a new TTFont object is returned. If ``inplace`` is True, the
input varfont is modified and reduced to a static font.
"""
if not inplace:
# make a copy to leave input varfont unmodified
stream = BytesIO()
varfont.save(stream)
stream.seek(0)
varfont = TTFont(stream)
fvar = varfont['fvar']
axes = {a.axisTag:(a.minValue,a.defaultValue,a.maxValue) for a in fvar.axes}
loc = normalizeLocation(location, axes)
if 'avar' in varfont:
maps = varfont['avar'].segments
loc = {k: piecewiseLinearMap(v, maps[k]) for k,v in loc.items()}
# Quantize to F2Dot14, to avoid surprise interpolations.
loc = {k:floatToFixedToFloat(v, 14) for k,v in loc.items()}
# Location is normalized now
log.info("Normalized location: %s", loc)
if 'gvar' in varfont:
log.info("Mutating glyf/gvar tables")
gvar = varfont['gvar']
glyf = varfont['glyf']
# get list of glyph names in gvar sorted by component depth
glyphnames = sorted(
gvar.variations.keys(),
key=lambda name: (
glyf[name].getCompositeMaxpValues(glyf).maxComponentDepth
if glyf[name].isComposite() else 0,
name))
for glyphname in glyphnames:
variations = gvar.variations[glyphname]
coordinates,_ = _GetCoordinates(varfont, glyphname)
origCoords, endPts = None, None
for var in variations:
scalar = supportScalar(loc, var.axes)
if not scalar: continue
delta = var.coordinates
if None in delta:
if origCoords is None:
origCoords,control = _GetCoordinates(varfont, glyphname)
endPts = control[1] if control[0] >= 1 else list(range(len(control[1])))
delta = iup_delta(delta, origCoords, endPts)
coordinates += GlyphCoordinates(delta) * scalar
_SetCoordinates(varfont, glyphname, coordinates)
else:
glyf = None
if 'cvar' in varfont:
log.info("Mutating cvt/cvar tables")
cvar = varfont['cvar']
cvt = varfont['cvt ']
deltas = {}
for var in cvar.variations:
scalar = supportScalar(loc, var.axes)
if not scalar: continue
for i, c in enumerate(var.coordinates):
if c is not None:
deltas[i] = deltas.get(i, 0) + scalar * c
for i, delta in deltas.items():
cvt[i] += otRound(delta)
if 'CFF2' in varfont:
log.info("Mutating CFF2 table")
glyphOrder = varfont.getGlyphOrder()
CFF2 = varfont['CFF2']
topDict = CFF2.cff.topDictIndex[0]
vsInstancer = VarStoreInstancer(topDict.VarStore.otVarStore, fvar.axes, loc)
interpolateFromDeltas = vsInstancer.interpolateFromDeltas
interpolate_cff2_PrivateDict(topDict, interpolateFromDeltas)
CFF2.desubroutinize(varfont)
interpolate_cff2_charstrings(topDict, interpolateFromDeltas, glyphOrder)
interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc)
del topDict.rawDict['VarStore']
del topDict.VarStore
if 'MVAR' in varfont:
log.info("Mutating MVAR table")
mvar = varfont['MVAR'].table
varStoreInstancer = VarStoreInstancer(mvar.VarStore, fvar.axes, loc)
records = mvar.ValueRecord
for rec in records:
mvarTag = rec.ValueTag
if mvarTag not in MVAR_ENTRIES:
continue
tableTag, itemName = MVAR_ENTRIES[mvarTag]
delta = otRound(varStoreInstancer[rec.VarIdx])
if not delta:
continue
setattr(varfont[tableTag], itemName,
getattr(varfont[tableTag], itemName) + delta)
log.info("Mutating FeatureVariations")
for tableTag in 'GSUB','GPOS':
if not tableTag in varfont:
continue
table = varfont[tableTag].table
if not hasattr(table, 'FeatureVariations'):
continue
variations = table.FeatureVariations
for record in variations.FeatureVariationRecord:
applies = True
for condition in record.ConditionSet.ConditionTable:
if condition.Format == 1:
axisIdx = condition.AxisIndex
axisTag = fvar.axes[axisIdx].axisTag
Min = condition.FilterRangeMinValue
Max = condition.FilterRangeMaxValue
v = loc[axisTag]
if not (Min <= v <= Max):
applies = False
else:
applies = False
if not applies:
break
if applies:
assert record.FeatureTableSubstitution.Version == 0x00010000
for rec in record.FeatureTableSubstitution.SubstitutionRecord:
table.FeatureList.FeatureRecord[rec.FeatureIndex].Feature = rec.Feature
break
del table.FeatureVariations
if 'GDEF' in varfont and varfont['GDEF'].table.Version >= 0x00010003:
log.info("Mutating GDEF/GPOS/GSUB tables")
gdef = varfont['GDEF'].table
instancer = VarStoreInstancer(gdef.VarStore, fvar.axes, loc)
merger = MutatorMerger(varfont, loc)
merger.mergeTables(varfont, [varfont], ['GDEF', 'GPOS'])
# Downgrade GDEF.
del gdef.VarStore
gdef.Version = 0x00010002
if gdef.MarkGlyphSetsDef is None:
del gdef.MarkGlyphSetsDef
gdef.Version = 0x00010000
if not (gdef.LigCaretList or
gdef.MarkAttachClassDef or
gdef.GlyphClassDef or
gdef.AttachList or
(gdef.Version >= 0x00010002 and gdef.MarkGlyphSetsDef)):
del varfont['GDEF']
addidef = False
if glyf:
for glyph in glyf.glyphs.values():
if hasattr(glyph, "program"):
instructions = glyph.program.getAssembly()
# If GETVARIATION opcode is used in bytecode of any glyph add IDEF
addidef = any(op.startswith("GETVARIATION") for op in instructions)
if addidef:
break
if addidef:
log.info("Adding IDEF to fpgm table for GETVARIATION opcode")
asm = []
if 'fpgm' in varfont:
fpgm = varfont['fpgm']
asm = fpgm.program.getAssembly()
else:
fpgm = newTable('fpgm')
fpgm.program = ttProgram.Program()
varfont['fpgm'] = fpgm
asm.append("PUSHB[000] 145")
asm.append("IDEF[ ]")
args = [str(len(loc))]
for a in fvar.axes:
args.append(str(floatToFixed(loc[a.axisTag], 14)))
asm.append("NPUSHW[ ] " + ' '.join(args))
asm.append("ENDF[ ]")
fpgm.program.fromAssembly(asm)
# Change maxp attributes as IDEF is added
if 'maxp' in varfont:
maxp = varfont['maxp']
if hasattr(maxp, "maxInstructionDefs"):
maxp.maxInstructionDefs += 1
else:
setattr(maxp, "maxInstructionDefs", 1)
if hasattr(maxp, "maxStackElements"):
maxp.maxStackElements = max(len(loc), maxp.maxStackElements)
else:
setattr(maxp, "maxInstructionDefs", len(loc))
if 'name' in varfont:
log.info("Pruning name table")
exclude = {a.axisNameID for a in fvar.axes}
for i in fvar.instances:
exclude.add(i.subfamilyNameID)
exclude.add(i.postscriptNameID)
varfont['name'].names[:] = [
n for n in varfont['name'].names
if n.nameID not in exclude
]
if "wght" in location and "OS/2" in varfont:
varfont["OS/2"].usWeightClass = otRound(
max(1, min(location["wght"], 1000))
)
if "wdth" in location:
wdth = location["wdth"]
for percent, widthClass in sorted(OS2_WIDTH_CLASS_VALUES.items()):
if wdth < percent:
varfont["OS/2"].usWidthClass = widthClass
break
else:
varfont["OS/2"].usWidthClass = 9
if "slnt" in location and "post" in varfont:
varfont["post"].italicAngle = max(-90, min(location["slnt"], 90))
log.info("Removing variable tables")
for tag in ('avar','cvar','fvar','gvar','HVAR','MVAR','VVAR','STAT'):
if tag in varfont:
del varfont[tag]
return varfont
def compile(self, axisTags):
result = [sstruct.pack(FVAR_INSTANCE_FORMAT, self)]
for axis in axisTags:
fixedCoord = floatToFixed(self.coordinates[axis], 16)
result.append(struct.pack(">l", fixedCoord))
return bytesjoin(result)